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首页> 外文会议>Fuel injection and sprays, 2010 >The Possibilities of Wax Precipitation from Diesel Fuels at High Pressure and its Influence on Diesel Engine Performance
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The Possibilities of Wax Precipitation from Diesel Fuels at High Pressure and its Influence on Diesel Engine Performance

机译：高压下柴油燃料中蜡沉淀的可能性及其对柴油机性能的影响

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Under high-pressure conditions such as those existing in a common-rail system, a serious concern is the possibility of wax precipitation from diesel fuels and the consequent deterioration in the diesel engine performance, even if the temperature is higher than the CP (cloud point) of the fuel. By using a diesel engine with a common-rail system, high-acceleration tests were performed under high-load conditions for three test fuels, which correspond to Japanese JIS grade 2 diesel fuels but have different cold-temperature properties, at a temperature exceeding their CPs. The test revealed differences in the engine speed and the throttle position among the test fuels. It was suggested that there was a possibility of a fault in fuel injection caused by the wax precipitation at high pressure. In order to clarify the cause of this phenomenon, the wax precipitation pressure of the test fuels were measured at each temperature by using a wax precipitation measurement system based on an optical technique. The results indicated that the wax precipitation occurred in the fuels at a temperature of 20 ℃ higher than the CP of the fuels under the operation pressure (approximately 130 MPa) of the common-rail system that was used for conducting the engine tests in this study. The wax precipitation pressure of market diesel fuels and model fuels were then measured at each temperature in order to clarify the relation between the wax precipitation behavior and fuel composition. The results revealed that light n-paraffins, isoparaffins, and alkyl benzenes offered an advantage in preventing wax precipitation from diesel fuels. On the other hand, mono-naphthenes, which were effective in lowering the CP, were less effective in preventing wax precipitation at high pressure.
机译：在高压条件下（例如共轨系统中存在的高压条件下），即使温度高于CP（浊点），柴油中也会有蜡沉淀的可能性以及随之而来的柴油机性能下降的严重问题。 ）的燃料。通过使用具有共轨系统的柴油发动机，在高负荷条件下对三种测试燃料进行了高加速测试，这三种燃料对应于日本JIS 2级柴油，但在超过其温度的情况下具有不同的低温特性。 CP。该测试揭示了测试燃料之间发动机转速和节气门位置的差异。有人认为，高压下的蜡沉淀可能会导致燃料喷射故障。为了弄清该现象的原因，通过使用基于光学技术的蜡析出测定系统，在各温度下对试验燃料的蜡析出压力进行了测定。结果表明，在用于本研究的发动机的共轨系统的工作压力（约130 MPa）下，蜡的沉淀比燃料的CP高出20℃。 。然后，在每种温度下测量市售柴油和模型燃料的蜡沉淀压力，以阐明蜡沉淀行为与燃料成分之间的关​​系。结果表明，轻质正构烷烃，异链烷烃和烷基苯在防止蜡从柴油中沉淀方面具有优势。另一方面，有效降低CP的单环烷烃在高压下防止蜡沉淀的效果较差。

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